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Updated: May 25, 2026

Writing Bragg Gratings in Multicore Fibers

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

Reflective fiber-optic refractometer based on a thin-core fiber tailored Bragg grating reflection.

Yue Ma¹, Xueguang Qiao, Tuan Guo

¹Department of Physics, Northwest University, Xi’an, Shaanxi, China. yuemanwu@gmail.com

|February 3, 2012

Summary

A new fiber optic sensor uses a thin-core fiber (TCF) and fiber Bragg grating (FBG) for precise surrounding refractive index (SRI) measurements. This cost-effective refractometer offers high sensitivity and temperature immunity for biological applications.

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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

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Published on: January 7, 2019

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Writing Bragg Gratings in Multicore Fibers

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Published on: April 20, 2016

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

Area of Science:

Optoelectronics
Fiber optic sensing
Biomedical instrumentation

Background:

Refractive index (RI) is a critical parameter in various scientific fields, including biology and chemistry.
Accurate and sensitive RI measurement techniques are essential for real-time monitoring and analysis.
Existing refractometry methods may face limitations in sensitivity, temperature stability, or cost-effectiveness.

Purpose of the Study:

To demonstrate a novel reflective refractometer utilizing a thin-core fiber (TCF) configuration.
To achieve high-sensitivity and temperature-immune measurement of surrounding refractive index (SRI).
To validate the sensor's performance within the biologically relevant RI range.

Main Methods:

A refractometer was constructed by sandwiching a TCF between a single-mode fiber (SMF) and an FBG-imprinted SMF stub.
The TCF acted as a bridge, coupling FBG core mode reflection to SRI variations.
Reflections were analyzed in two distinct wavelength bands corresponding to core and cladding modes.
Cost-effective power detection was employed for SRI measurements.

Main Results:

The sensor exhibited reflection in two distinct wavelength bands (core and cladding modes).
A linear response was observed for SRI measurements.
Enhanced sensitivity of 133.26 dB/refractive index unit was achieved.
Temperature-immune SRI measurements were successfully performed within the 1.33-1.41 range.

Conclusions:

The demonstrated TCF-based reflective refractometer offers a novel and effective approach for SRI sensing.
The sensor provides high sensitivity and temperature immunity, making it suitable for biological applications.
The cost-effective design and performance validate its potential for widespread use in refractive index measurements.